Descriptions:
KTP
Nonlinear crystal Potassium Titanyl Phosphate is the most commonly used material for frequency
doubling of Nd-doped lasers, particularly at the low or medium power density. It
is widely used for frequency mixing to generate Red/Green/Blue output, and for
OPO and OPA to generate visible to mid-infrared tunable output. It is also used
for many E-O devices such as Q-switches and E-O modulators.
Main
applications:
1） Frequency
Doubling (SHG) of Nd-doped Lasers for Green/Red Output;
2） Frequency Mixing (SFM) of Nd Laser and Diode
Laser for Blue Output;
3） Parametric
Sources (OPG, OPA and OPO) for 600nm - 4500nm Tunable Ouptut;
4） E-O
Modulators, Optical Switches, Directional Couplers;
5） Optical
Waveguides for Integrated NLO and E-O DevicesOPA and OPO.
Advantages:
1) Large nonlinear
optical coefficient;
2) Wide angular bandwidth
and small walk-off angle
3) Broad temperature and
spectral bandwidth;
4) High Electro-Optics(E-O)
coefficient and low dielectric constant;
5) Non-hygroscopic,
chemically and mechanically stable
Optical and
Nonlinear properties of KTP crystal
|
Transparency Range
|
350~4500nm
|
|
SHG Phase Matchable Range
|
497 ~ 1800nm (Type II)
|
|
Therm-optic Coefficient (/℃, λ in μm)
|
dnx/dT=1.1X10-5
dny/dT=1.3X10-5
dnz/dT=1.6X10-5
|
|
Absorption Coefficients
|
<0.1%/cm at 1064nm
<1%/cm at 532nm
|
|
Angle Acceptance
|
14.2mrad·cm (φ);55.3mrad·cm (θ) for Type II SHG of a Nd:YAG laser at 1064nm
|
|
Temperature Acceptance
|
24°C·cm for Type II SHG of a Nd:YAG
laser at 1064nm
|
|
Spectral Acceptance
|
0.56nm·cm for Type II SHG of a Nd:YAG laser at
1064nm
|
|
Walk-off Angle
|
0.55° for Type II SHG of a Nd:YAG
laser at 1064nm
|
|
NLO Coefficients
|
deff(II)≈(d24 - d15)sin2Φsin2θ - (d15sin2Φ + d24cos2Φ)sinθ
|
|
Non-vanished NLO susceptibilities
|
d31=6.5 pm/V d24=7.6 pm/V
d32= 5 pm/V d15=6.1 pm/V
d33=13.7 pm/V
|
|
Sellmeier Equations (λ in μm)
|
nx2=3.0065+0.03901/(λ2-0.04251)-0.01327λ2
ny2=3.0333+0.04154/(λ2-0.04547)-0.01408λ2
nz2=3.3134+0.05694/(λ2-0.05658)-0.01682λ2
|
|
Electro-optic Coefficients:
r13
r23
r33
r51
r42
|
Low and High frequency (pm/V)
9.5 and 8.8
15.7and 13.8
36.3 and 35
7.3 and 6.9
9.3 and 8.8
|
|
Relative Dielectric Constant
|
εeff=13
|
Physical
properties of KTP crystal
|
Crystal Structure
|
Orthorhombic, space group Pna21,point group mm2
|
|
Lattice Parameter
|
a=6.404Å, b=10.616Å, c=12.814A, Z=8
|
|
Melting Point
|
About 1172°C
|
|
Mohs Hardness
|
5
|
|
Density
|
3.01 g/cm3
|
|
Refractive indices
|
nX = 1,7404; nY = 1,7479; nZ = 1,8296 @1064 nm
|
|
Thermal Conductivity
|
13W/m/K
|
|
Thermal Expansion Coefficients
|
ax=11x10-6/℃, ay=9x10-6/℃, az=0.6x10-6/℃
|
HGO offers KTP specifications:
|
Tolerance of cutting angle
|
△θ≤±0.25°,△φ≤±0.25°
|
|
Tolerance of dimension
|
Dimension+0/-0.1 mm，L：±0.1mm
|
|
Flatness
|
λ/10 @ 632.8nm
|
|
Wavefront distortion
|
λ/8@ 632.8nm
|
|
Surface quality
|
10/5 per MIL-O-13830A
|
|
Parallelism
|
20″
|
|
Perpendicularity
|
5′
|
|
Clear Aperture:
|
> 90%
|
|
Chamfer:
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< 0.1 mm @ 45°
|
|
Size
|
Upon customer request
|
|
Coating
|
AR/HR coating upon customer’s request
|
|
Damage Threshold
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750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz
|
|
Quality Warranty Period
|
One
year under proper use
|
Why
Choose HGO ?
HGO can supply high
quality potassium titanyl phosphate (KTiOPO4, KTP) nonlinear crystals. Size up to 20mm*20mm*40mm
and length from 0.1mm up to 80mm.
Besides, HGO provides high grey track
resistance HGTR-KTP crystals as a solution, which significantly improves the
grey-track resistance and overall performance. HGTR-KTP crystals extend the use
of KTP as a nonlinear medium to high-power applications.
